some compilation errors when compiling on cygwin/msys

[Kreijstal]

# cargo test
   Compiling serde v1.0.228
   Compiling lmdb-master-sys v0.2.5 (/home/topkek/git/heed/lmdb-master-sys)
   Compiling lmdb-master3-sys v0.2.5 (/home/topkek/git/heed/lmdb-master3-sys)
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_env_setup_locks':
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:31: error: implicit declaration of function 'pthread_mutexattr_setrobust'; did you mean 'pthread_mutexattr_settype'? [-Wimplicit-function-declaration]
warning: lmdb-master-sys@0.2.5:  5533 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
warning: lmdb-master-sys@0.2.5:       |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
warning: lmdb-master-sys@0.2.5:       |                               pthread_mutexattr_settype
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:67: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_DEFAULT'?
warning: lmdb-master-sys@0.2.5:  5533 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
warning: lmdb-master-sys@0.2.5:       |                                                                   ^~~~~~~~~~~~~~~~~~~~
warning: lmdb-master-sys@0.2.5:       |                                                                   PTHREAD_MUTEX_DEFAULT
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:67: note: each undeclared identifier is reported only once for each function it appears in
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_mutex_failed':
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:462:41: error: implicit declaration of function 'pthread_mutex_consistent'; did you mean 'pthread_mutex_init'? [-Wimplicit-function-declaration]
warning: lmdb-master-sys@0.2.5:   462 | #define mdb_mutex_consistent(mutex)     pthread_mutex_consistent(mutex)
warning: lmdb-master-sys@0.2.5:       |                                         ^~~~~~~~~~~~~~~~~~~~~~~~
warning: lmdb-master-sys@0.2.5: /home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:11427:31: note: in expansion of macro 'mdb_mutex_consistent'
warning: lmdb-master-sys@0.2.5: 11427 |                         rc2 = mdb_mutex_consistent(mutex);
warning: lmdb-master-sys@0.2.5:       |                               ^~~~~~~~~~~~~~~~~~~~
error: failed to run custom build command for `lmdb-master-sys v0.2.5 (/home/topkek/git/heed/lmdb-master-sys)`

Caused by:
  process didn't exit successfully: `/home/topkek/git/heed/target/debug/build/lmdb-master-sys-d9bdc96b1433d202/build-script-build` (exit status: 1)
  --- stdout
  cargo::rerun-if-changed=lmdb
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master-sys-22dbfaca755a7c21/out)
  OPT_LEVEL = Some(0)
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_ENCODED_RUSTFLAGS = Some(-L/usr/lib-lpython3.12)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CC_x86_64-pc-cygwin
  CC_x86_64-pc-cygwin = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_cygwin
  CC_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(true)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master-sys-22dbfaca755a7c21/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master-sys-22dbfaca755a7c21/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master-sys-22dbfaca755a7c21/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_env_setup_locks':
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:31: error: implicit declaration of function 'pthread_mutexattr_setrobust'; did you mean 'pthread_mutexattr_settype'? [-Wimplicit-function-declaration]
  cargo:warning= 5533 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
  cargo:warning=      |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  cargo:warning=      |                               pthread_mutexattr_settype
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:67: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_DEFAULT'?
  cargo:warning= 5533 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
  cargo:warning=      |                                                                   ^~~~~~~~~~~~~~~~~~~~
  cargo:warning=      |                                                                   PTHREAD_MUTEX_DEFAULT
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:5533:67: note: each undeclared identifier is reported only once for each function it appears in
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_mutex_failed':
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:462:41: error: implicit declaration of function 'pthread_mutex_consistent'; did you mean 'pthread_mutex_init'? [-Wimplicit-function-declaration]
  cargo:warning=  462 | #define mdb_mutex_consistent(mutex)     pthread_mutex_consistent(mutex)
  cargo:warning=      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~
  cargo:warning=/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c:11427:31: note: in expansion of macro 'mdb_mutex_consistent'
  cargo:warning=11427 |                         rc2 = mdb_mutex_consistent(mutex);
  cargo:warning=      |                               ^~~~~~~~~~~~~~~~~~~~

  --- stderr


  error occurred in cc-rs: command did not execute successfully (status code exit status: 1): LC_ALL="C" "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-m64" "-Wno-unused-parameter" "-Wbad-function-cast" "-Wuninitialized" "-DMDB_IDL_LOGN=16" "-D_DEFAULT_SOURCE" "-D_BSD_SOURCE" "-o" "/home/topkek/git/heed/target/debug/build/lmdb-master-sys-22dbfaca755a7c21/out/b40eeb0d3a911fbe-mdb.o" "-c" "/home/topkek/git/heed/lmdb-master-sys/lmdb/libraries/liblmdb/mdb.c"


warning: build failed, waiting for other jobs to finish...
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_env_setup_locks':
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:31: error: implicit declaration of function 'pthread_mutexattr_setrobust'; did you mean 'pthread_mutexattr_settype'? [-Wimplicit-function-declaration]
warning: lmdb-master3-sys@0.2.5:  5896 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
warning: lmdb-master3-sys@0.2.5:       |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
warning: lmdb-master3-sys@0.2.5:       |                               pthread_mutexattr_settype
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:67: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_DEFAULT'?
warning: lmdb-master3-sys@0.2.5:  5896 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
warning: lmdb-master3-sys@0.2.5:       |                                                                   ^~~~~~~~~~~~~~~~~~~~
warning: lmdb-master3-sys@0.2.5:       |                                                                   PTHREAD_MUTEX_DEFAULT
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:67: note: each undeclared identifier is reported only once for each function it appears in
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_mutex_failed':
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:465:41: error: implicit declaration of function 'pthread_mutex_consistent'; did you mean 'pthread_mutex_init'? [-Wimplicit-function-declaration]
warning: lmdb-master3-sys@0.2.5:   465 | #define mdb_mutex_consistent(mutex)     pthread_mutex_consistent(mutex)
warning: lmdb-master3-sys@0.2.5:       |                                         ^~~~~~~~~~~~~~~~~~~~~~~~
warning: lmdb-master3-sys@0.2.5: /home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:12166:31: note: in expansion of macro 'mdb_mutex_consistent'
warning: lmdb-master3-sys@0.2.5: 12166 |                         rc2 = mdb_mutex_consistent(mutex);
warning: lmdb-master3-sys@0.2.5:       |                               ^~~~~~~~~~~~~~~~~~~~
error: failed to run custom build command for `lmdb-master3-sys v0.2.5 (/home/topkek/git/heed/lmdb-master3-sys)`

Caused by:
  process didn't exit successfully: `/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-db45170391ab171c/build-script-build` (exit status: 1)
  --- stdout
  cargo::rerun-if-changed=lmdb
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-373068e0f68f7156/out)
  OPT_LEVEL = Some(0)
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_ENCODED_RUSTFLAGS = Some(-L/usr/lib-lpython3.12)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CC_x86_64-pc-cygwin
  CC_x86_64-pc-cygwin = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_cygwin
  CC_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(true)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-373068e0f68f7156/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-373068e0f68f7156/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  OUT_DIR = Some(/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-373068e0f68f7156/out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-cygwin)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2)
  HOST = Some(x86_64-pc-cygwin)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_cygwin
  CFLAGS_x86_64_pc_cygwin = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-cygwin
  CFLAGS_x86_64-pc-cygwin = None
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_env_setup_locks':
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:31: error: implicit declaration of function 'pthread_mutexattr_setrobust'; did you mean 'pthread_mutexattr_settype'? [-Wimplicit-function-declaration]
  cargo:warning= 5896 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
  cargo:warning=      |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  cargo:warning=      |                               pthread_mutexattr_settype
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:67: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_DEFAULT'?
  cargo:warning= 5896 |                 if (!rc) rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
  cargo:warning=      |                                                                   ^~~~~~~~~~~~~~~~~~~~
  cargo:warning=      |                                                                   PTHREAD_MUTEX_DEFAULT
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:5896:67: note: each undeclared identifier is reported only once for each function it appears in
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c: In function 'mdb_mutex_failed':
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:465:41: error: implicit declaration of function 'pthread_mutex_consistent'; did you mean 'pthread_mutex_init'? [-Wimplicit-function-declaration]
  cargo:warning=  465 | #define mdb_mutex_consistent(mutex)     pthread_mutex_consistent(mutex)
  cargo:warning=      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~
  cargo:warning=/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c:12166:31: note: in expansion of macro 'mdb_mutex_consistent'
  cargo:warning=12166 |                         rc2 = mdb_mutex_consistent(mutex);
  cargo:warning=      |                               ^~~~~~~~~~~~~~~~~~~~

  --- stderr


  error occurred in cc-rs: command did not execute successfully (status code exit status: 1): LC_ALL="C" "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-m64" "-Wno-unused-parameter" "-Wbad-function-cast" "-Wuninitialized" "-DMDB_IDL_LOGN=16" "-D_DEFAULT_SOURCE" "-D_BSD_SOURCE" "-o" "/home/topkek/git/heed/target/debug/build/lmdb-master3-sys-373068e0f68f7156/out/b40eeb0d3a911fbe-mdb.o" "-c" "/home/topkek/git/heed/lmdb-master3-sys/lmdb/libraries/liblmdb/mdb.c"

[Kerollmops]

Hey @Kreijstal 👋

I don't know exactly why this happened, and I'm not using Cygwin myself, so I can't help much. However, we are compiling LMDB ourselves using the cc crate and may have forgotten some options or imports.

What I don't quite get is why it works on Windows but not with Cygwin 🤔

Would you mind taking a look, please?
Have a nice day 🌵

[Kreijstal]

cygwin env is not windows, it is posix runtime (newlib's libc) ported to windows, with windows C ABI . So if you attempt to use win32 api in C, it will fail as c macros will not define _WIN32, and will not want to link to the OS. The solution is usually recognize cygwin with headers, and compile it as if it were posix/unix/bsd/linux